Improve try-state docs (#13967)

* Improve Try-State docs

* fmt

* fixes

substrate/utils/frame/try-runtime/cli/src/lib.rs

@@ -248,7 +248,7 @@
 //! # assuming there's `./substrate --dev --tmp --ws-port 9999` or similar running.
 //! ./substrate-try-runtime \
 //!     try-runtime \
-//!     --runtime kitchensink_runtime.wasm \
+//!     --runtime runtime-try-runtime.wasm \
 //!     -lruntime=debug \
 //!     on-runtime-upgrade \
 //!     live --uri ws://localhost:9999
@@ -260,7 +260,7 @@
 //! ```bash
 //! ./substrate-try-runtime \
 //!     try-runtime \
-//!     --runtime kitchensink_runtime.wasm \
+//!     --runtime runtime-try-runtime.wasm \
 //!     -lruntime=debug \
 //!     on-runtime-upgrade \
 //!     live --uri ws://localhost:9999 \
@@ -295,7 +295,7 @@
 //! Then, we can use it to have the same command as before, `on-runtime-upgrade`
 //!
 //! ```bash
-//! try-runtime \
+//! ./substrate-try-runtime try-runtime \
 //!     --runtime runtime-try-runtime.wasm \
 //!     -lruntime=debug \
 //!     on-runtime-upgrade \
@@ -309,7 +309,7 @@
 //!     --runtime runtime-try-runtime.wasm \
 //!     -lruntime=debug \
 //!     execute-block live \
-//!     --uri ws://localhost:999
+//!     --uri ws://localhost:9999
 //! ```
 //!
 //! This can still be customized at a given block with `--at`. If you want to use a snapshot, you
@@ -320,15 +320,22 @@
 //!
 //! ```bash
 //! ./substrate-try-runtime try-runtime \
-//!     --runtime runtime-try-runtime.wasm \
-//!     -lruntime=debug \
-//!     execute-block live \
-//!     --try-state System,Staking \
-//!     --uri ws://localhost:999
+//!    --runtime runtime-try-runtime.wasm \
+//!    -lruntime=debug \
+//!    execute-block \
+//!    --try-state System,Staking \
+//!    live \
+//!    --uri ws://localhost:9999 \
+//!    --pallet System Staking
 //! ```
 //!
-//! Will only run the `try-state` of the two given pallets. See
-//! [`frame_try_runtime::TryStateSelect`] for more information.
+//! Will only run the `try-state` of the two given pallets. When running `try-state` against
+//! some real chain data it can take a long time for the command to execute since it has to
+//! query all the key-value pairs. In scenarios like above where we only want to run the
+//! `try-state` for some specific pallets, we can use the `--pallet` option to specify from
+//! which pallets we want to query the state. This will greatly decrease the execution time.
+//!
+//! See [`frame_try_runtime::TryStateSelect`] for more information.
 //!
 //! * Follow our live chain's blocks using `follow-chain`, whilst running the try-state of 3 pallets
 //!   in a round robin fashion